As a minor point of interest, I have been using @url import() to include a common CSS theme across a number of keys I own, and Mikau has similarly been providing a free to use CSS theme that way. I felt it was a very nifty feature, allowing common CSS updates to fix display issues for all users and lessening the maintenance effort for someone who just wants a freely available theme.

Just recently I have noticed the keys I own do not have a theme, falling back to the blue BYOND default. It may well be something on my end, but just to rule out possibilities, was a change made to filter these imports out?